Facebook Ads Audience Targeting Strategy: Interest-Based vs. Lookalike vs. Broad

Master Facebook audience targeting. Learn when to use interest targeting, lookalikes, or broad targeting for maximum ROI.

Facebook offers multiple ways to target your ads: interest-based targeting, lookalike audiences, and broad targeting (Advantage+ audience). Each has strengths and weaknesses. The key is knowing which to use when, and how to test systematically to find what works for your business.

Root Causes

Over-Reliance on Interest Targeting

Many advertisers only use interest-based targeting ('people interested in yoga' or 'small business owners'). But Facebook's interest data is often outdated or inaccurate, and these audiences are highly competitive, driving up costs.

Not Using Lookalike Audiences

Lookalike audiences are based on your actual customers, not Facebook's guesses about interests. If you have a customer list or pixel data, lookalikes almost always outperform interest targeting—but many businesses never set them up.

Fear of Broad Targeting

Advertisers are scared to 'let Facebook decide' who sees their ads. But Facebook's algorithm has gotten very good at finding your customers if you give it conversion data to learn from. Broad targeting often finds customers you would never have thought to target.

What to Fix First

Start with Lookalike Audiences

Upload your customer list (emails or phone numbers) and create a 1% lookalike audience. This is Facebook finding people similar to your best customers. Test 1%, 3%, and 5% lookalikes. In most cases, 1-3% lookalikes will be your best performers.

Test Broad Targeting with Advantage+ Audience

Create a campaign with no detailed targeting—just age, gender, and location. Let Facebook's algorithm find your customers based on who converts. This works best if you have at least 50 conversions per week for the algorithm to learn from.

Use Interest Targeting for Cold Awareness Campaigns

Interest targeting still has a place—especially for top-of-funnel awareness campaigns where you're introducing your brand to new people. But don't expect it to be your most efficient conversion driver.

Layer Exclusions, Not Inclusions

Instead of narrowing your audience with multiple interests (which makes it tiny and expensive), start broad and exclude people who definitely aren't your customer. Exclude your existing customers, exclude irrelevant locations, but otherwise let Facebook find your audience.

Why Traditional Agencies & Tools Fail

Agencies often stick with what they know—interest targeting—because it feels like they're 'doing something'. They're scared to test broad targeting because it feels like giving up control. But control is an illusion if your interest-based campaigns are underperforming.

Common Patterns We See

  • Lookalike audiences based on 'purchasers' typically outperform interest-based audiences by 30-60% in cost per conversion.
  • Broad targeting (Advantage+ audience) needs at least 50 conversions per week to perform well. Below that threshold, it struggles to learn.
  • Stacking multiple interests (e.g., 'yoga AND meditation AND wellness') shrinks your audience and increases CPM by 40-80% compared to using just one interest.

How Marko Helps

We test all three audience types systematically and show you the results. You can see in your portal which audience types drive the lowest cost per conversion for your business. We're not attached to any one method—we use what works.

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